There are five main negatives I looked at for a player to qualify for this list: age, injury history, current contract, rumored acquisition cost and opportunity cost.
In a perfect world, teams would trade for young players who are either signed to team-friendly deals or are young and not injury-prone, so signing them to a long-term deal would be a smart move. While the cost in those deals will be higher, the value of high-end, cost-controlled prospects around the league is greater than ever, so it is even more important to get equal value in return.
Some players on this list have multiple concerns, and some only have one. But they all have one thing in common: I wouldn’t want my team to trade for any of them. I will list other options, either on the trade market or in free agency, teams should pursue instead.